Method for expanding the capacity for local storage of chemical products or their solutions in reservoir rock

Abstract

The present invention relates to a method for storing chemical products or their solutions in reservoir rock. In said method, the cargo boat containing the chemical product to be stored in the reservoir is connected to the production platform through an appropriate connection and connecting to the well header. The product is pumped through the chemical product capture line using a triplex chemical injection pump aligned to the head of the production or injection well. The product is pumped through the surface lines, riser and subsea line and, passing through the WCT, it is injected into the reservoir through the production or injection string.

The invention claimed is: 
     
       1. A method for storing chemical products or their solutions in reservoir rock, comprising the steps of:
 (a) assessing a compatibility of the chemical product to be stored with a selected subsea reservoir; 
 (b) selecting a product volumetry; 
 (c) sending the chemical product to a production or injection header of a stationary production unit (SPU); 
 (d) positioning the chemical product in a temporary storage tank present in the SPU; 
 (e) pressurizing and sending the chemical product to a wellhead which passes the chemical product to a subsea line for injection into the reservoir; 
 (f) penetrating the chemical product into reservoir rock of the reservoir, where it will be stored for later use; and 
 (g) removing the chemical product from the reservoir rock and sending the removed chemical product to another wellhead which passes the removed chemical product to another subsea line for injection into another subsea reservoir, where a treatment using the removed chemical product will be carried out. 
 
     
     
       2. The method according to  claim 1 , wherein the chemical product comprises a product selected from the group consisting of sulfonates, carboxylic acids and amides, or combinations thereof. 
     
     
       3. The method according to  claim 2 , wherein the chemical product is selected from the group consisting of pentaphosphonates, phosphinopolycarboxylate, polyvinylsulfonate, sulfonated polyacrylic copolymers, polyacrylates, polyaspartates of α-linkage, polyaspartates of β-linkage, carboxy-methyl-inulin, or combinations thereof. 
     
     
       4. The method according to  claim 1 , wherein the chemical product is selected from the group consisting of hydrate inhibitor, alcohols, glycols, poly-ethylene glycol, surfactants, silicone- or perfluorosilicone-based anti-foaming agents, or combinations thereof. 
     
     
       5. The method according to  claim 1 , wherein in step (b), the volumetry of the chemical product is between 500 and 1000 bbl (79.49 and 158.99 m 3 ). 
     
     
       6. The method according to  claim 1 , wherein in step (c), the chemical product is sent through a transfer line by a cargo vessel. 
     
     
       7. The method according to  claim 1 , wherein in step (e), the pressurizing and sending are carried out through an injection skid. 
     
     
       8. The method according to  claim 7 , wherein a pumping pressure of each reservoir is at least 300 psi. 
     
     
       9. The method according to  claim 1 , wherein in step (f), the penetration of the chemical product is carried out through an injection or production string. 
     
     
       10. The method according to  claim 1 , wherein the chemical product will be pumped from a container in alignment with a production or injection well and stored in the container in a reservoir condition. 
     
     
       11. The method according to  claim 1 , wherein each wellhead is located between sea level and a mud line below the sea level.